chore: add issue and pull request templates (bnb-chain#13)

* chore: add issue and pull request templates

* fix typo

.github/ISSUE_TEMPLATE/bug.md

@@ -1,17 +1,19 @@
 ---
 name: Report a bug
-about: Something with go-ethereum is not working as expected
+about: Something with opBNB is not working as expected
 title: ''
 labels: 'type:bug'
 assignees: ''
 ---
 
 #### System information
 
-Geth version: `geth version`
-CL client & version: e.g. lighthouse/nimbus/prysm@v1.0.0
+Network: `mainnet`/`testnet`/`local`
+
+if you are running a local node, please provide the following information:
+op-node version: `op-node version`
+op-geth version: `op-geth -v`
 OS & Version: Windows/Linux/OSX
-Commit hash : (if `develop`)
 
 #### Expected behaviour
 

.github/ISSUE_TEMPLATE/question.md

@@ -6,4 +6,4 @@ labels: 'type:docs'
 assignees: ''
 ---
 
-This should only be used in very rare cases e.g. if you are not 100% sure if something is a bug or asking a question that leads to improving the documentation. For general questions please use [discord](https://discord.gg/nthXNEv) or the Ethereum stack exchange at https://ethereum.stackexchange.com.
+This should only be used in very rare cases e.g. if you are not 100% sure if something is a bug or asking a question that leads to improving the documentation. For general questions please use [discord](https://discord.gg/bnbchain).

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,17 @@
+### Description
+
+add a description of your changes here...
+
+### Rationale
+
+tell us why we need these changes...
+
+### Example
+
+add an example CLI or API response...
+
+### Changes
+
+Notable changes:
+* add each change in a bullet point here
+* ...