Began working on a README and added example CSVs

db/seed/README.md

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+# Adding items to the database
+
+Anyone can add data to the database via a Pull Request on Github. Fork the repository, then create a new CSV file in the
+`updates` folder with the date, type of item you're updating, and the next number in the sequence. The most important
+part is the type of item, which should be plural for convention. This is what tells the service how to process your
+data.
+
+```
+20240618-characters-001.csv
+20241231-weapons-010.csv
+20250115-summons-025.csv
+```
+
+It's recommended to use a CSV editor to edit this data, but something like Microsoft Excel or Numbers should work fine
+too.
+
+## Required values
+
+You are required to set values for the following fields:
+TBA
+
+## Arrays
+
+When adding the `character_id`, `nicknames_en`, or `nicknames_jp`, make sure to wrap your values in brackets ({}). If
+there are multiple values, you can separate them with a comma (,) with no spaces on either side.
+
+```
+# character_id, Zeta and Vaseraga (Halloween):
+{3024,3025}
+
+# nicknames_en, Threo
+{sarasa,cake,thalatha}
+```
+
+## Value tables
+
+Values for properties like `element` are pre-defined, so you only need to input the corresponding digit.
+
+#### Rarity
+
+| Rarity | Value |
+|--------|-------|
+| SSR    | 3     |
+| SR     | 2     |
+| R      | 1     |
+
+#### Element
+
+| Element | Value |
+|---------|-------|
+| Wind    | 1     |
+| Fire    | 2     |
+| Water   | 3     | 
+| Earth   | 4     |
+| Dark    | 5     |
+| Light   | 6     | 
+
+#### Proficiency
+
+| Proficiency | Value |
+|-------------|-------|
+| Sabre       | 1     |
+| Dagger      | 2     |
+| Axe         | 3     |
+| Spear       | 4     |
+| Bow         | 5     | 
+| Staff       | 6     |
+| Melee       | 7     |
+| Harp        | 8     |
+| Gun         | 9     |
+| Katana      | 10    |
+
+#### Race
+
+| Race    | Value |
+|---------|-------|
+| Unknown | 0     |
+| Human   | 1     |
+| Erune   | 2     |
+| Draph   | 3     |
+| Harvin  | 4     |
+| Primal  | 5     |
+
+#### Gender
+
+| Gender      | Value |
+|-------------|-------|
+| Other       | 0     |
+| Male        | 1     |
+| Female      | 2     |
+| Male/Female | 3     | 
+
+#### Weapon Series
+
+| Series Name | Value |
+|-------------|-------|
+
+#### Summon Series
+
+| Series Name | Value |
+|-------------|-------|
+
+### Wiki links
+
+You should try to provide identifiers for the 4 major wikis: gbf.wiki, gbf-wiki.com (JA), Kamigame (JA) and Gamewith (
+JA). Here's how:
+
+#### gbf.wiki
+
+This is simply the item's name, as it appears after `https://gbf.wiki/` in the URL.
+
+```
+https://gbf.wiki/Bahamut -> Bahamut
+```
+
+#### Gamewith
+
+This is a 5 to 6 digit string that appears at the end of the URL.
+
+```
+https://xn--bck3aza1a2if6kra4ee0hf.gamewith.jp/article/show/21612 -> 21612
+```
+
+#### Kamigame
+
+Use a [URL decoder](https://www.urldecoder.org/) to extract the Japanese characters from the URL after the final forward
+slash (/) and before `.html`.
+
+```
+https://kamigame.jp/%E3%82%B0%E3%83%A9%E3%83%96%E3%83%AB/%E3%82%AD%E3%83%A3%E3%83%A9%E3%82%AF%E3%82%BF%E3%83%BC/SSR%E3%83%A4%E3%83%81%E3%83%9E.html 
+-(decoder)-> 
+https://kamigame.jp/グラブル/キャラクター/SSRヤチマ.html
+-(value)->
+SSRヤチマ
+```
+
+#### gbf-wiki.com
+
+Use a [URL decoder](https://www.urldecoder.org/) to extract the Japanese characters from the URL after the question
+mark. Replace the `+` with a space.
+
+```
+https://gbf-wiki.com/?%E3%83%A4%E3%83%81%E3%83%9E+(SSR)%E3%83%AA%E3%83%9F%E3%83%86%E3%83%83%E3%83%89%E3%83%90%E3%83%BC%E3%82%B8%E3%83%A7%E3%83%B3
+-(decoder)-> 
+https://gbf-wiki.com/?ヤチマ+(SSR)リミテッドバージョン
+-(value)->
+ヤチマ (SSR)リミテッドバージョン
+```

db/seed/updates/20250101-characters-000.csv.example

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+name_en,name_jp,granblue_id,rarity,element,proficiency1,proficiency2,gender,race1,race2,flb,min_hp,max_hp,max_hp_flb,min_atk,max_atk,max_atk_flb,base_da,base_ta,ougi_ratio,ougi_ratio_flb,special,ulb,max_hp_ulb,max_atk_ulb,character_id,wiki_en,release_date,flb_date,ulb_date,wiki_ja,gamewith,kamigame,nicknames_en,nicknames_jp
+Gran,グラン,3040001000,3,1,1,2,1,1,0,true,1200,6800,8160,6400,8000,9600,6,3,4.5,5.0,false,false,0,0,{1},/wiki/Gran,2014-03-10,2016-04-01,,/wiki/グラン,/gran,/3040001000,{MC},"{主人公,グラン様}"

db/seed/updates/20250101-summons-000.csv.example

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+name_en,name_jp,granblue_id,rarity,element,series,flb,ulb,max_level,min_hp,max_hp,max_hp_flb,max_hp_ulb,min_atk,max_atk,max_atk_flb,max_atk_ulb,subaura,limit,transcendence,max_atk_xlb,max_hp_xlb,summon_id,release_date,flb_date,ulb_date,wiki_en,wiki_ja,gamewith,kamigame,transcendence_date,nicknames_en,nicknames_jp
+Bahamut,バハムート,2040003000,3,0,Divine Beasts,true,true,100,600,2400,2880,3360,1500,2000,2400,2800,true,true,true,3200,3840,1,2014-03-10,2016-04-01,2020-07-15,/wiki/Bahamut,/wiki/バハムート,/bahamut,/2040003000,2023-01-15,{Baha},"{バハ,黒龍}"

db/seed/updates/20250101-weapons-000.csv.example

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+name_en,name_jp,granblue_id,rarity,element,proficiency,series,flb,ulb,max_level,max_skill_level,min_hp,max_hp,max_hp_flb,max_hp_ulb,min_atk,max_atk,max_atk_flb,max_atk_ulb,extra,ax_type,limit,ax,recruits_id,max_awakening_level,release_date,flb_date,ulb_date,wiki_en,wiki_ja,gamewith,kamigame,nicknames_en,nicknames_jp,transcendence,transcendence_date
+Aschallon,アスカロン,1040014000,4,1,1,1,true,true,150,15,220,2200,2640,3080,2450,2940,3528,4116,false,1,true,true,,5,2014-03-10,2016-04-01,2020-07-15,/wiki/Aschallon,/wiki/アスカロン,/aschallon,/1040014000,{Asca},"{アスカ,アスカロン}",true,2023-01-15