Create Economy.md

Begin resolving #1
Referenced old essentials wiki. Added new config options with their explanation. Added how to use signs with economy.

Still needs: Explain how to use an alternative economy plugin

Economy.md

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+# EssentialsX Economy
+The built in economy API will redirect to any other detected economy system such as vault. This means you can use EssEco api as a economy api instead of vault if your plugin is dependent on Essentials.
+## Commands
+There are a number of commands for use in-game, including but not limited to:
+   - /eco, /economy: Allows you to take, give, or reset a player's money.
+   - /sell: Sells an item and amount at the price specified in the worth.yml.
+   - /balance, /bal, /money: Displays the current balance of a player.
+   - /baltop, /balancetop: Displays a list of the richest people.
+   - /pay: Pays a specified player from your balance.
+## Configuration
+There are a number of different options related to the internal economy system which can be found in the `config.yml`.
+Most of the config options are explained adequately in the comments:
+```yml
+# Defines the balance with which new players begin. Defaults to 0.
+starting-balance: 0
+
+# Defines the cost to use the given commands PER USE.
+# Some commands like /repair have sub-costs, check the wiki for more information.
+command-costs:
+  # /example costs $1000 PER USE
+  #example: 1000
+  # /kit tools costs $1500 PER USE
+  #kit-tools: 1500
+
+# Set this to a currency symbol you want to use.
+# Remember, if you want to use special characters in this document, 
+# such as accented letters, you MUST save the file as UTF-8, not ANSI.
+currency-symbol: '$'
+
+# Enable this to make the currency symbol appear at the end of the amount rather than at the start.
+# For example, the euro symbol typically appears after the current amount.
+currency-symbol-suffix: false
+
+# Set the maximum amount of money a player can have.
+# The amount is always limited to 10 trillion because of the limitations of a java double.
+max-money: 10000000000000
+
+# Set the minimum amount of money a player can have (must be above the negative of max-money).
+# Setting this to 0, will disable overdrafts/loans completely.  Users need 'essentials.eco.loan' perm to go below 0.
+min-money: -10000
+
+# Enable this to log all interactions with trade/buy/sell signs and sell command.
+economy-log-enabled: false
+
+# Enable this to also log all transactions from other plugins through Vault.
+# This can cause the economy log to fill up quickly so should only be enabled for testing purposes!
+economy-log-update-enabled: false
+```
+EssentialsX adds the ability to specify the minimum transaction amount to prevent the dreaded microtransactions:
+```yml
+# Minimum acceptable amount to be used in /pay.
+minimum-pay-amount: 0.001
+```
+EssentialsX adds currency format to improve the localization. You may uncomment the currency-symbol-format-locale or uncomment currency format and create your own:
+```yml
+# The format of currency, excluding symbols. See currency-symbol-format-locale for symbol configuration.
+#
+# "#,##0.00" is how the majority of countries display currency.
+#currency-format: "#,##0.00"
+
+# Format currency symbols. Some locales use , and . interchangeably.
+# Some formats do not display properly in-game due to faulty Minecraft font rendering.
+#
+# For 1.234,50 use de-DE
+# For 1,234.50 use en-US
+# For 1'234,50 use fr-ch
+#currency-symbol-format-locale: en-US
+```
+#### Permissions
+[Permissions for commands can be found here](https://essinfo.xeya.me/permissions.html) (Community maintained list)
+
+Important permissions include `essentials.eco` and  `essentials.pay`.
+## Signs & Shops
+Signs may be used to create shops where players can buy and sell items/blocks to the server in exchange for money. 
+#### Signs
+To create a sign, ensure that you have the `signs.create.trade` permission and that you have uncommented `- buy` and `- sell` under `enabledSigns:` in the config.yml
+If a sign is placed and the following is typed:
+```
+[Buy]
+1
+Dirt
+$1
+```
+The sign will allow players with the `signs.use.buy` permission to purchase 1 dirt for $1 when left clicked. If `[Buy]` is changed to `[Sell]` and the player has the respective permission, the player may sell 1 dirt to the server in exchange for $1.
+#### Shops
+To prevent players exploiting the the economy by purchasing from the server using a buy sign and `/sell`, only create Buy signs at or above the rates found in `worth.yml`.
+A good server shop typically offers bulk Sell signs at better rates than the `worth.yml` to encourage players to use the shop over `/sell`.
+Alternatively, if players aren't given the `essentials.sell` permission their only option is to trade between players or go to the shop.